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https://issues.apache.org/jira/browse/HDFS-4240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13511393#comment-13511393
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Hudson commented on HDFS-4240:
------------------------------
Integrated in Hadoop-Mapreduce-trunk #1277 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1277/])
HDFS-4240. For nodegroup-aware block placement, when a node is excluded,
the nodes in the same nodegroup should also be excluded. Contributed by
Junping Du (Revision 1416691)
Result = SUCCESS
szetszwo :
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1416691
Files :
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicyDefault.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicyWithNodeGroup.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestReplicationPolicyWithNodeGroup.java
> In nodegroup-aware case, make sure nodes are avoided to place replica if some
> replica are already under the same nodegroup
> --------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-4240
> URL: https://issues.apache.org/jira/browse/HDFS-4240
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Reporter: Junping Du
> Assignee: Junping Du
> Fix For: 3.0.0
>
> Attachments: HADOOP-9045.patch, HADOOP-9045-v2.patch,
> HADOOP-9045-v3.patch, HADOOP-9045-v4.patch, HDFS-4240.patch
>
>
> In previous implementation for HADOOP-8468, 3rd replica is avoid to place on
> the same nodegroup of 2nd replica. But it didn't provide check on nodegroup
> of 1st replica, so if 2nd replica's rack is not efficient to place replica,
> then it is possible to place 3rd and 1st replica within the same node group.
> We need a change to remove all nodes from available nodes for placing replica
> if there already replica on the same nodegroup.
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